Book-sewing machine



L. EGGER BOOK SEWING MACHNE Filed Dec. 21, 192; 3 sheets-sheet 1 67 62 .2 76 7\ Fu/@afar Apr. 10,1923.

. L. EGGER BooK SEWING MACHINE Filed Dec. 2l, 1921 Z sheets-sheet 2 Apr. 10, 1923. 11,459,911@

' L. EGGER BOOK SEWING MACHINE Filed Dec 2l, 1921 5 sheets-sheet 5 Patented .-hpr. l, 1922?.

LOUIS EGGER, OF SUMISWALD-GRUNEN, BERNE, SWITZERLAND.

Book-servirte MACHINE.

Application led December 21, 1921.

To all 'whom t may concern:

Be it known that l, Louis Eeden, a citizen of the Swiss Confederation, and residing at Sumiswald-Grunen, Berne, Switzerland, have inventedV certain new and useful improvements in Book-Sewing Machines, (for which l have filed an application in Switzerland on Becember 18, 1920), of which the following is a specification.

rfhe present invention has reference to improvements in book sewing machines of the type in which, in cooperation with a rock* ing work table and a reciprocating perfora tor, one or more sets of stitching needles, each set comprising a hooked needle and an eyed needle, reciprocate vertically in timed relation with a thread layer transversely reciprocating between the needles, and the invention has for its object to generally improve the construction and operation of such machines, mainly as relates to the guida-nce of the sewing threadl and the operation of the work table, as will now be described in detail in connection with the accompanying` drawings, in which Fig. 1 is a front elevation of the machine, several parts heilig omitted for the sake of clearness; Fig.A 2 is a side elevation, partly in section; Figs. 3, 4 and 5 illustrate the thread clamping de'- vice in front view, vertical section and detail top view respectively; liig. 6 is a fragmental front view of themiddle part of the machine, of which Fig. 7 is a side elevation, part-lv in section; Fig. 8 is a front view of a stitching head, and Fig. 9 is a section therethrough; Fig. 10, finally, illustrates a detail of Fig. 3 in section.

As shown by way of example the machine is provided with only one set of stitching units, which includes an eyed needle'and a hooked needle, for stitching the sheets at one placen only, but it is to be understood that, for operating on wide sheets, twoV or more such stitchingunits may be provided.

The standards 1 and 2 iournal the main l driving shaft 3 to whichlis fixed between the standards a cam disc 4 presenting on its inner face two cam grooves 8 and 9, from which are respectively actuated the work table and the stitching headsl with their needles, and 'on the left outside of standard 2 there is fixed on the shaft 3 ay cam disc with a cam groove 7 for actuating the perforator bar. Of these cam curves there are shown in Fig. 2 only the inner circumferential edges in dotted outline. To the hub sition and rotates the thread layer.

Serial No. 523,989.

of cani disc there is fixed the cam drum 6, provided on its circumference with the substantially parallelly directed, intercrossing cam grooves 61 and 62, which serve to disw place the eye needles, as later on fully described.

rFhe work table comprises the two leaves 10 and'11 which are laterally supported by the lever legs 12 and 13 iixedly extending from the rock sha-ft 14 journaled in the standards 1 and 2. This rocking table is actuated by the link 15 whose upper end is lined on the rock shaft 14 and whose lower end, provided with a roller 16, is guided in the cam groove 3 of disc 4. 0n the rocking table isI mounted the thread layer 18 and also the perforator bar.` The hooked thread layer 13 is secured to a horizontal rod 17 which can be reciprocated longitudinally in the two table legs 12 and 13 by means of a bell crank 2G pivoted on a frame bracket 19 and a link member 21 (Fig. 1) adapted to be vertically reciprocated in any suitable manner, not specially shown here. From the left end of the shiftable rod 17 rigidly depends a slide arm 22 and a spring 23 which latter, on the lateral displacement of the rod 17 contactinolv slidesV on the .Ouide rail Q4 fixed on the table leg 13.

rFhe perforator bar 64 carries the piercing or punching members 25 and reciprocates vertically on the guide cheeksI 26 and 2G. and it i s actuated by the link rods 28 and 23 which are pivoted below to the levers 3l and 31 fixed to a shaft 30 which is journaled in the table legs 10 and 13 parallel to the rock shaft 14. To the shaft is further secured a three-arm lever 33 to the lower end of which is pivoted the one end of a connecting rod 34, whose other end is fixed vto a cross-head 3.5 supporting a roller 36 which latter extends into and is actuated by the cam groove 7. the side members 37 and 37 beingl guided in a cross-member 38 loosely riding on shaft 3.

To the upper end of this triple lever 33 is secured a screw bolt 39, adapted to press against the slide arm 22 (Fig. 7 when the latter assumes its outermost operative po- The third arm 67 of the triple lever 33 serves for locking` the work table.

The table locking mechanism comprises a slide 69 presenting above a hook nose or latch 68, which slide is reciprocably mounted by guide bolts 71 and 71; on the standard 2v .by the rod with the bell crank and is influenced by the draw spring 70, said bolts passing through slots 69 in the slide. Obviously, such a latch slide may be provided also on the other standard l.

ln the longitudinally slotted cross-head ell), up and doivn reciprocable on the lateral `guide cheeks #l-l and Lll, is mounted a bar a2 1with capability of longitudinal displacenient. Gn this bar is fixed a stitching head ll suiviporting' the eyed needle ll'j whilst a stitching head a5, supporting a hooked needle 45 at the loiver end of the needle carrier 59 and a pinion del at the upper end, is niounted on the cross-head 4:0. ',he latter is actuated by means ot the connecting rods 926 and sie pivoted to the bell cranks std and t9 lined on thc slia'l't 4:7. the ends oi' -which latter are iournaled in the standards l and 2. Below there is lined iii these standards shaft 29 on which is rockingjly iiiounted the tWo-arni lever 32, the outer end cgt which is connected 49. rlhe a roller inner end of this lever carries 9 ol the 5l whichcngages in the cani groove disc Ll.

For making` the crit-li its stitching rcciprocated trein the logrooved cani disc 6 by the intermediary o1" the double-armed lever 54C, rockinaly journaled in the support bracket 53. The upper end ot this lever 54 is pivoted to the outer end ot a cross-rod 57 and its loiver slide shoe end 52 alternately engages in the drinn grooves Gl and 62.

yTo the horizontally displaceable rod 55 is fixed a fork nieiiiber 0G which by nieans ot the cross-rod 57 connects with the lever 54 and straddles a bolt 5S. freely extending' through the slotted crosshead d0 and lined in the bar 42 2).

The hooked needle is rotated by means of the pinion lll xed on the needle carrier 59 in coaction with the stationary rack 60, the cross-head 40 being; liorizontall).7 displaced as byy cani ineans. not shown` The stitching head 43 is provided with a longitudinal groove 72 (Fing. l0) in which the bai' 711. carrying, the eye-needle 2(guide 73 can be reciprocated. Frein a crossbar 75 tired on the standards l and 2 rigidly extends the needle plate 76, Which on the one hand serves as counter-pressure ineinber for the pertorator and on the other hand has support tor the hooked needle guide 77. and also as support tor the longitudinally `grooved guide plate 78. From the bar 74 extends rearwardly a linger 79 Which engages in a `groove 78 in the guide plate 7S in such manner that on reciproca tion of the eyed needle head and on transverse displacement thereofY the relative position of the needle guide 73 will always remain the saine. y

Above the Work table there is provided in the standards l and 2 a rock shaft 65 supporting the stripper-oil' 66, lwhich latter serves zig-zaag stitch the bar 42 head a3 is horizontally to press the last stitched sheet against the just previously stitched sheet.` This stripper-oil is actuated from the cani disc 8O (F l) by the intermediary lot the canip'roove operated bell crank 8l and the connecting- Ji` rod 82, which latter is pivo-ted on the lever ai'ni lO-l rigidly extending from the rock shaft 65.

ll'poii the cross-bar 825, connecting the standard@ 'l and 2. is mounted the thread clamping device. rthe bar 83 is provided With downwardly tapering' bores 853. in which ennae'e the truncated cone shaped plugs Se (Figs. 3, d and 5). The bore'ivalls are split at one side to present thread int-roducing passages 85. For each needle pair there is provided one such bore. Freni the top ot each plug; extends aguide pin Se slidable in the guide bar 86, and a spring` tends to press the plug down into its sea-t. For opera-ting` this thread tensioning device there is provided in contact with the bottom it' of the plug or plugs al swingr bar 88, which is acted on by screws and 99 extending' iroin arins 89 and 89", which latter torni rigid parts of the stripper-off 66 (Fig. rlhe entire thread tension mechanism torins, as it were, an independent unit.

From the standards l and 2 rise respectively the supports 91 and 91 connected by a shell" 92. upon which are mounted the thread spools 93 and the bracket supports 9e and 9st. These latter are interconnected by two rods 95 and 96 which serve as thread Aguides. Freni the shaft 97, rotatably mounted in the standards l. and 2, rigidly extend the lever arnis 98 and 98 to the outer ends of which are pivoted the draw rods 100 and 100', connected by the cross-rod 99. which supports a thread tensioning spring' 101, the draiv rods 100 and 1.00 being guided in the cross-bar 83. This thread tensioner is actuated by means ot' a cam disc. not shown here. bv the intermediary of the draw-rod 103 and the lever arm 102 lined on.v sha-Et 97.

The operation of 'the described mechanisnis is the following: The sheet to be stitched is placed upon the Work table. which is in the outer, dotted-line position in Fig. 2. After the table has been swunginto the :toll-line position. thesheet is nre-pierced by the periorating' needles. During; the ascent of the latter the lever arin 67 swings down. causing' the hook 68 of the slide 69 to latch into the slotted table leaf l1 (Fig. 7) which locks the Work table. so that it cannot recede in the direction of the arrow under the pressure exerted by the perforating operation. ln the sewing of wide sheets, for instance for large ledgers and the like, a relatively large number of perforating needles are used, so that, especially with thick folds. quite a strong pressure has to be reckoned with, and tor this reason it is advisable to securely lock the table.` After the holes have loo been punched the perforator 64 recedes and the lock slide 69 is moved up again by the arm G7 for releasing the table. Into the sheet through a. halt-revolution, and deposits it into the hook thereof. The screws 90 and 90 recede from the swing bar 88 and the plugs 8a are pressed down into their seats by the springs 8'? for clamping the thread. The insertion of the thread and the rotation of the thread layer is brought about by the short cam surface 7 in the cam groove 7 (Fig. 2) whereby the lever 33 is roclred and causes the slide lever 22 to swing rearwardly which takes place after the rod 17 has completed its longitudinal displacement toward the hoolred needle. On the ascent of the stitching` needles the introduced thread is caught by the hooked needle and the caught loop is drawn through the loop or the previously stitched sheet which still surrounds the hook-needle, whereupon the latter is again turned through a halt-revolution. During the latter part ol: the needle ascent the thread is dra-wn taut by the thread tensioning levers 98 and 98, so that a chainstitch of close formation from sheet to sheet is obtained.

The thread is drawn off the supply spools by a thread drawing mechanism, well known in the art and for that reason not specially shown here. After the thread layer has returned into its initial position the table is swung back into its outer, dotted-line position (Fig. 2), thev slide shoe 52 changing from the drum groove 6l over into groove 62 which shifts the eyed needle toward the left. Simultaneously the stripper-off 66 is swung down into the dotted-line position II `in Fig. 2, presses the halves oic the just stitched sheet together `and at once returns into the full-line position. A fresh sheet is now placed upon the work table and the de scribed operations are repeated, the slide shoe 52, in this instance, changing baclr again JIrom the groove 62 into groove 6l,

shifting baclr thereby the eyed needle from left to right, so that the eye-needle executes a stitch ot zig-zag formation upon the baclr of the book.

What I claim is l. In a boolr sewing machine, a work table, means roclringly supporting the same, a perorator, means tor latching the table in an operative position for perforating operation, and means operable by and during actuation of the perorator for rendering said second means operative.

2. In a boolr sewing machine, a movably supported worlr table, perforating means carried thereby, latch means for holding the table fixed during operation of said irst means, and a common actuator for simultaneously rendering said perforating means and latch means operative.

3. In a boolr sewing machine, a laterally reciprocable stitching` head, an eye-needle bar slidably mounted thereon, a stationary perforated needle plate carried by the head, a horizontal guide plate on said needle plate, and means carried by the bar and slidably engaged with the guide plate for permitting horizontal displacement of said needle guide with said needle bar.

4. In a bool; sewing machine, including a pertorator and a rocking work table, means for locking said work table during the perforating operation, comprising a slide member, a spring-influenced latch extending therefrom, adapted to coact with said rocking work table in the operative position thereof, and cam operated means for disconnecting said latch and said work table immediately after the perforating operation.

5. In a bool; sewing machine, including a periiorator and a laterally reciprocable stitching head presenting a longitudinal groove in its outer tace, an eye-needle bar reciprocable in said groove, a stationary perforated needle plate, serving as counterpressure member during the perforating operation and as guide for said eye-needle bar, a horizontally slotted guide plate on said needle plate, a iinger inwardly extending from said needle bar, adapted to be guided in the slot of said guide plate, :tor the purpose of allowing horizontal displacement of said needle guide with said needle bar, but preventing it from following the latters vertical displacement.

. In testimony whereof I ailix my signature.

LOUIS EGGER. 

